Journal of Pharmacology and Pharmacotherapeutics

CORRESPONDENCE
Year
: 2014  |  Volume : 5  |  Issue : 2  |  Page : 167--169

European Heart and Rhythm Association guidelines on new oral anticoagulants: A bold step forward


Vishal Sehgal1, Sukhminder Jit Singh Bajwa2,  
1 Department of Medicine, The Commonwealth Medical College, Scranton, PA 18510, USA
2 Department of Anaesthesiology and Intensive Care Medicine, Gian Sagar Medical College, Banur, Patiala, Punjab, India

Correspondence Address:
Sukhminder Jit Singh Bajwa
House No. 27 A, Ratan Nagar, Tripuri, Patiala, Punjab, India




How to cite this article:
Sehgal V, Bajwa SS. European Heart and Rhythm Association guidelines on new oral anticoagulants: A bold step forward.J Pharmacol Pharmacother 2014;5:167-169


How to cite this URL:
Sehgal V, Bajwa SS. European Heart and Rhythm Association guidelines on new oral anticoagulants: A bold step forward. J Pharmacol Pharmacother [serial online] 2014 [cited 2019 Sep 16 ];5:167-169
Available from: http://www.jpharmacol.com/text.asp?2014/5/2/167/130147


Full Text

Sir,

Medical science is witnessing a progressive revolution and evolution throughout the globe with continual improvement in diagnostics and therapeutic interventions. The literary and practical updates in medical sciences are highly essential for the betterment of patients well-being. The article "new factor Xa inhibitor" published in the current issue of the journal by Bhanwra and Ahluwalia is a comprehensive review of orally active anticoagulant apixaban. [1] The article definitely adds to our current knowledge about these new revolutionary drugs for the prevention of thrombosis, stroke and other clinical diseases associated coagulation abnormalities. A comprehensive review of new orally active anticoagulants "new orally active anticoagulants in critical care and anesthesia practice: the good, the bad and the ugly" was published in annals of cardiac anesthesia that had emphasized the lack of consideration for drug drug interaction and renal insufficiency which can jeopardize the safe and efficacious use of new oral anticoagulant (NOAC) and make them look bad or ugly. [2]

It had also been emphasized that there is a strong need for guidelines on drug drug interaction and renal dosing to promote the safe and more efficacious use of NOACs. European heart and rhythm association (EHRA) have come out with definitive guidelines on the drug drug interaction and renal dosing which is a bold new step forward in promoting the safe and efficacious use of NOACs.

NOACs have ushered a new era in anticoagulation. [3] Vitamin K antagonists (VKA) have traditionally been the standard of care for treating patients with venous thromboembolism (VTE) or at risk of VTE. With their predictable pharmacokinetics and pharmacodynamics, they are an excellent replacement for VKA. [4] Clinicians around the world have approached NOACs with trepidation and caution secondary to their drug interactions and variable renal clearance and rightly so. [5] EHRA have come out with guidelines on drug drug interactions and definitive recommendations so as when to stop NOACs prior to elective surgical procedures in patient with underlying renal insufficiency.

In view of lack of monitoring tests it is very important that drug drug interactions be taken into consideration prior to and after starting these medications. EHRA has come out with tabulated drug drug interactions with NOAC with definitive guidelines so as what to do in a particular clinical scenario. Color coding has been done to define the clinical impact of the drug drug interaction [Table 1]. [6] The red code indicates that the drug is contraindicated, orange indicates that dose reduction is needed and presence of two or more yellow codes indicate that either the NOAC may not be used or dose reduction to be done or use with caution. The interpretation of yellow code has been left to the discretion of clinician as to take appropriate action in the given clinical scenario. Furthermore, the drug interaction where data is lacking but significant interaction is expected has been hatched. Again caution has been advised in use of NOAC in those particular drugs. Definitive dose changes have been advised where warranted. For apixaban dose needs to be decreased to 2.5 mg BID from 5 mg BID. For rivaroxaban dose reduction to 15 mg daily from 20 mg daily and for dabigatran etexilate dose reduction from 150 mg BID to 110 mg BID is needed.{Table 1}

Furthermore, they have come up with specific guidelines as when to stop the NOACs prior to elective surgeries. [6] For all NOACs, holding period before elective surgeries is 1-2 days depending on whether there is low or high risk of bleed. These aspects are highly significant in renal diseases where strategies have to be worked out for peri-operative renal protection. [7] In case of renal insufficiency with creatinine clearance (CrCL) <30 the holding time is 36-48 h for Xa inhibitors. For dabigatran holding time varies depending on CrCL as it is 90% excreted renally [Table 2]. It has also been advised not to use NOACs in patients with CrCL <30 as there is no outcome data. These facts make it mandatory to adopt an evidence based approach rather than switching to logical empiricism. [8] Furthermore, Cockroft method was used previously to calculate CrCL which uses ideal body weight in calculating CrCL.{Table 2}

Drug interactions of NOACs are mediated through p-glycoprotein and cytochrome 3A4. These are involved in the metabolism of large number of drugs in clinical use. The tabulated color coded drug drug interaction is an excellent and bold attempt to make the use of NOACs safer and more efficacious. Continued improvisation of this would go a long way in making NOACs safer and more efficacious and thereby reducing the morbidity and mortality associated with VTE and atrial fibrillation.

References

1Bhanwra S, Ahluwalia K. The new factor Xa inhibitor: Apixaban. J Pharmacol Pharmacother 2014;5:12-4.
2Sehgal V, Bajwa SJ, Bajaj A. New orally active anticoagulants in critical care and anesthesia practice: The good, the bad and the ugly. Ann Card Anaesth 2013;16:193-200.
3Mantha S, Cabral K, Ansell J. New avenues for anticoagulation in atrial fibrillation. Clin Pharmacol Ther 2013;93:68-77.
4Alberts MJ, Eikelboom JW, Hankey GJ. Antithrombotic therapy for stroke prevention in non-valvular atrial fibrillation. Lancet Neurol 2012;11:1066-81.
5Rivaroxaban and atrial fibrillation: Continue to use warfarin or in some cases, dabigatran. Prescrire Int 2012;21:257-60.
6Heidbuchel H, Verhamme P, Alings M, Antz M, Hacke W, Oldgren J, et al. EHRA practical guide on the use of new oral anticoagulants in patients with non-valvular atrial fibrillation: Executive summary. Eur Heart J 2013;34:2094-106.
7Bajwa SJ, Sharma V. Peri-operative renal protection: The strategies revisited. Indian J Urol 2012;28:248-55.
8Bajwa SJ, Kalra S. Logical empiricism in anesthesia: A step forward in modern day clinical practice. J Anaesthesiol Clin Pharmacol 2013;29:160-1.